The application of high-efficiency diesel engines, hybrid systems, waste heat recovery (WHR) systems, aftertreatment systems, and advanced drivetrains were all examined as possible approaches to improve the fuel consumption of heavy-duty, long-haul commercial trucks that mainly drive on highways.
In this study, the strategies that were employed in an effort to improve the fuel consumption performance of the diesel engine itself and the results of evaluating and testing the actual engine are reported.
When the evaluation results from the standalone engine tests were examined, it was found that the use of a downsized diesel engine with high brake mean effective pressure (BMEP), a two-stage turbocharging system, a dual loop EGR (HPL-EGR and LPL-EGR) system, a new combustion chamber, and a fuel injection system with new nozzle geometry achieved a substantial reduction in the fuel consumption in the frequently-used engine operating region that occurs when the trucks are driven on the highway.